Hi true blue 6 . . .
Your measurements make sense as does your conclusion. The firing order of a Chevy Six is 153624 with the cylinders ordered from front to back:
| 1 | 2 | 3 | 4 | 5 | 6 |
This means that the outer most ports (from valves 1 and 6) only blow exhaust every other rotation of the crank - whereas the siamese ports get a blast of exhaust every time around . . . the first time around from valves 2 and 4 . . . the second time around from valves 3 and 5 . . .
Curious though. What prompted you to measure this?
regards,
stock49
